Not sure about the Canon flashes. I'd check into the NISSIN Di866. I bought it for my Nikon, and it is superb. High guide number, lots of options, all the tilt and swivel you want, can be triggered by onboard flash or camera (if so equipped) and has many functions. Best of all, I paid Can$ 260 for it. Ebay. The Nikon SB900 would have been double that, and I am sure the Canon Speedlight will be the same.